Read about the gray crescent in your textbook. How does its location relate to the site of sperm penetration and the cytoplasmic events following it?
What will be an ideal response?
The gray crescent forms after fertilization and opposite the point of penetration.
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Which form of speciation is most rapid?
A. allopatric speciation on the mainland B. allopatric speciation on island archipelagos C. sympatric speciation via polyploidy D. sympatric speciation via disruptive selection E. sympatric speciation via character displacement
The radioactive decay of an isotope can be best compared to a ____
a. clock b. radio c. mp3 player d. metronome e. microwave oven
Which organ filters blood that has collected wastes from cells throughout the body and maintains the homeostasis of body fluids?
a. kidneys b. heart c. lungs d. Pacemaker
There are _____ microbial cells living on and in our bodies compared to the number of our body cells
a. ten times more b. ten times less c. about the same number of d. about half as many e. 100 times more